Multistage crushing-grinding integrated device for powder coating production and use method thereof

Abstract

The application discloses a kind of multistage crushing-grinding integrated equipment and use method for powder coating production, belong to powder coating production equipment technical field.It includes machine body, crushing mechanism, screening mechanism, grinding mechanism, grading mechanism, first return mechanism and second return mechanism, machine body top is equipped with feed inlet, first return port, second return port and finished product collecting port, inside is sequentially equipped with crushing cavity, buffer bin and grinding cavity from top to bottom.Wherein, crushing mechanism is arranged in crushing cavity;Screening mechanism is arranged in buffer bin;Grinding mechanism is arranged in grinding cavity;Grading mechanism is arranged in grinding mechanism discharge end;First return mechanism two ends are respectively connected with first return port and crushing cavity feed end, and second return mechanism two ends are respectively connected with second return port and grinding cavity feed end.The equipment can reduce energy consumption and labor cost, reduce material pollution risk, ensure that finished product particle size is uniform, improve qualified rate.

Description

Technical Field

[0001] This invention relates to the field of powder coating production equipment technology, and in particular to a multi-stage crushing-grinding integrated equipment and its usage method for powder coating production. Background Technology

[0002] Powder coating is a solvent-free coating applied in powder form. It offers advantages such as being pollution-free, recyclable, environmentally friendly, and energy-saving, and is widely used in metal anti-corrosion spraying, household appliances, automotive parts, and building materials. The production process of powder coating mainly includes: raw material batching, mixing, melt extrusion, tableting and cooling, crushing, fine grinding, grading and screening, and packaging.

[0003] Crushing and grinding are key processes that determine the particle size and particle size distribution of the finished powder coating. In existing technologies, the crushing and grinding processes are typically performed by separate equipment: the extruded and compressed sheet material first enters a crusher for coarse crushing to obtain millimeter-sized particles; then the coarsely crushed particles are transferred to a grinding mill for fine grinding to obtain micron-sized powder. This separate arrangement has the following drawbacks: (1) Materials need to be transferred between different equipment, which increases labor costs and transportation energy consumption. At the same time, materials are easily contaminated or mixed with impurities during the transfer process. (2) The crushing and grinding process parameters lack linkage control, and the particle size fluctuation of the crushed output directly affects the grinding efficiency and the quality of the finished product; (3) The lack of an effective intermediate screening and return mechanism means that insufficiently crushed particles enter the grinding process, increasing the grinding burden, and powder that does not meet the grinding standards is difficult to return for reprocessing online; (4) The equipment occupies a large area and the production line is long, which is not conducive to the intensive use of production space.

[0004] Therefore, there is an urgent need to develop an integrated equipment that highly integrates multi-stage crushing and grading grinding, automatically transfers materials, and has online screening and return functions. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated multi-stage crushing-grinding equipment and its usage method for powder coating production, so as to solve the problems existing in the prior art, effectively reduce energy consumption and labor costs, effectively reduce the risk of material contamination, effectively ensure uniform particle size of finished products, and effectively improve the pass rate.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides an integrated multi-stage crushing and grinding equipment for powder coating production, comprising: a machine body, a crushing mechanism, a screening mechanism, a grinding mechanism, a grading mechanism, a first return material mechanism, and a second return material mechanism. The top of the machine body is provided with a feed inlet, a first return material inlet, a second return material inlet, and a finished product collection inlet. The interior of the machine body, from top to bottom, is provided with a crushing chamber, a buffer chamber, and a grinding chamber. The crushing mechanism is disposed within the crushing chamber for multi-stage crushing of the material. The screening mechanism is disposed within the buffer chamber for particle size classification of the crushed material, and the large-diameter discharge end of the screening mechanism is connected to the first return material inlet. The small-diameter discharge end of the screening mechanism is connected to the grinding chamber; the grinding mechanism is disposed in the grinding chamber and is used to grind the screened material; the grading mechanism is disposed at the discharge end of the grinding mechanism and is used to pneumatically grade the ground material; the large-diameter discharge end of the grading mechanism is connected to the second return port; the qualified-diameter discharge end of the grading mechanism is connected to the finished product collection port; one end of the first return mechanism is connected to the first return port, and the other end extends to the feed end of the crushing chamber; one end of the second return mechanism is connected to the second return port, and the other end extends to the feed end of the grinding chamber.

[0007] Preferably, the crushing mechanism includes a primary crushing component and a secondary crushing component arranged sequentially along the material travel direction. The crushing particle size of the primary crushing component is larger than that of the secondary crushing component. The primary crushing component includes two toothed rollers that rotate relative to each other, and the surface of the toothed rollers is provided with crushing teeth. The secondary crushing component includes two hammer rollers that rotate relative to each other, and the surface of the hammer rollers is provided with hammers.

[0008] Preferably, the screening mechanism includes a grading screen and a vibrator. The grading screen is disposed at the bottom of the buffer chamber, and the vibrator is disposed on one side of the buffer chamber and is connected to the grading screen in a transmission manner. The grading screen is inclined, and the lower inclined end of the grading screen is the large particle diameter discharge end of the screening mechanism, and the bottom of the grading screen is the small particle diameter discharge end of the screening mechanism.

[0009] Preferably, the grinding mechanism includes a drive mechanism, a moving grinding disc, a stationary grinding disc, and an adjustment component. The fixed end of the drive mechanism is fixedly connected to the machine body, and the output end of the drive mechanism is drivenly connected to the moving grinding disc to drive the moving grinding disc to rotate. The stationary grinding disc is slidably connected to the inner wall of the machine body in the vertical direction, forming a grinding gap between the stationary grinding disc and the moving grinding disc for material to pass through. The fixed end of the adjustment component is fixedly connected to the machine body, and the output end of the adjustment component is fixedly connected to the stationary grinding disc to drive the stationary grinding disc to move in the vertical direction to adjust the size of the grinding gap.

[0010] Preferably, the adjusting component is an electric push rod, the driving mechanism is a drive motor, and the grinding surface of the moving grinding disc is provided with grinding patterns.

[0011] Preferably, the grading mechanism includes a grading shell, an air inlet pipe, and an induced draft fan. The feed end of the grading shell is connected to the discharge end of the grinding chamber. The air inlet pipe is provided on one side of the grading shell, and the finished product collection port is provided on the other side of the grading shell. The second return port is provided at the bottom of the grading shell, and the induced draft fan is located at the finished product collection port.

[0012] Preferably, the air inlet of the air inlet pipe is provided with an air volume regulating valve.

[0013] Preferably, the first return mechanism and / or the second return mechanism are spiral conveying pipes.

[0014] Preferably, the exterior of the machine body is provided with a sealing cover, and a sound insulation cavity is formed between the sealing cover and the machine body, and the sound insulation cavity is filled with sound insulation material.

[0015] The present invention also provides a method for using the multi-stage crushing-grinding integrated equipment for powder coating production as described in any of the above claims, comprising the following steps: S1: Start the equipment: Start the crushing mechanism, the screening mechanism, the grinding mechanism, the grading mechanism, the first return material mechanism, and the second return material mechanism; S2: Feeding and Crushing: The extruded and compressed sheet material is fed into the crushing chamber through the feed inlet, and the crushing mechanism performs multi-stage crushing on the material to obtain crushed particles; S3: Screening and grading: The crushed particles fall into the buffer chamber, and the screening mechanism classifies the crushed particles by particle size. Small particles with a particle size smaller than the screen mesh size pass through the screening mechanism and enter the grinding chamber. Large particles with a particle size larger than the screen mesh size enter the first return mechanism from the large particle size discharge end of the screening mechanism through the first return port, and are sent back to the feed end of the crushing chamber by the first return mechanism for re-crushing. S4: Grinding process: Small-diameter particles entering the grinding chamber are pulverized into micron-sized powder under the grinding action of the grinding mechanism; S5: Pneumatic Classification: The ground powder enters the classification mechanism and is pneumatically classified under the action of airflow. Powder with qualified particle size enters the finished product collection port from the qualified particle size discharge end of the classification mechanism and is collected. Powder with large particle size that does not meet the standard enters the second return material mechanism from the large particle size discharge end of the classification mechanism through the second return material port and is sent back to the feed end of the grinding chamber for re-grinding by the second return material mechanism.

[0016] The present invention achieves the following technical effects compared to the prior art: This invention provides an integrated multi-stage crushing-grinding equipment and method for powder coating production. It highly integrates multi-stage crushing, screening, grinding, pneumatic classification, and a multi-stage return material mechanism within a single machine body. This eliminates the need to transfer materials between the crushing and grinding equipment, reducing manual handling costs and energy consumption, and avoiding the risk of impurities being introduced during material transfer. It also significantly shortens the production line length, reduces equipment footprint, and promotes efficient use of production space. By setting up a screening mechanism and a first return material mechanism after the crushing process, large particles that do not meet the required crushing particle size can be sent back to the crushing chamber for re-crushing, ensuring that all material entering the grinding process meets the required particle size. This avoids insufficiently crushed particles increasing the grinding burden. Furthermore, by setting up a classification mechanism and a second return material mechanism after the grinding process, powder that does not meet the finished product particle size requirements can be sent back to the grinding chamber for re-grinding, effectively ensuring uniform particle size in the finished product and improving the product qualification rate. Simultaneously, it enables continuous production throughout the entire process of crushing, screening, grinding, and classification, effectively improving overall production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the integrated multi-stage crushing-grinding equipment for powder coating production provided by the present invention; Figure 2 A front sectional view of the integrated multi-stage crushing-grinding equipment for powder coating production provided by the present invention; In the diagram: 1. Machine body; 101. Feed inlet; 102. First return inlet; 103. Second return inlet; 104. Finished product collection inlet; 2. Toothed roller; 3. Hammer roller; 4. Grading screen; 5. Vibrator; 6. Drive motor; 7. Moving grinding disc; 8. Electric push rod; 9. Stationary grinding disc; 10. Grading shell; 11. Air inlet pipe; 12. Exhaust fan; 13. Air volume regulating valve; 14. First return mechanism; 15. Second return mechanism; 16. Control unit. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide an integrated multi-stage crushing-grinding equipment and its usage method for powder coating production, so as to solve the problems existing in the prior art, effectively reduce energy consumption and labor costs, effectively reduce the risk of material contamination, effectively ensure uniform particle size of finished products, and effectively improve the pass rate.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 This embodiment provides a multi-stage crushing-grinding integrated equipment for powder coating production, such as... Figures 1-2As shown, the system includes: a machine body 1, a crushing mechanism, a screening mechanism, a grinding mechanism, a grading mechanism, a first return material mechanism 14, and a second return material mechanism 15. The top of the machine body 1 is provided with a feed inlet 101, a first return material inlet 102, a second return material inlet 103, and a finished product collection inlet 104. The interior of the machine body 1, from top to bottom, is provided with a crushing chamber, a buffer chamber, and a grinding chamber. The crushing mechanism is located in the crushing chamber for multi-stage crushing of the material. The screening mechanism is located in the buffer chamber for particle size classification of the crushed material, with the large-diameter discharge end of the screening mechanism connected to the first return material inlet 102 and the small-diameter discharge end connected to the grinding chamber. The grinding mechanism is located in the grinding chamber for grinding the screened material. The grading mechanism is located at the discharge end of the grinding mechanism for pneumatic classification of the ground material, with the large-diameter discharge end of the grading mechanism connected to the second return material inlet 103 and the qualified-diameter discharge end connected to the finished product collection inlet. The collection port 104 has one end of the first return material mechanism 14 connected to the first return material port 102, and the other end extending to the feed end of the crushing chamber; one end of the second return material mechanism 15 is connected to the second return material port 103, and the other end extends to the feed end of the grinding chamber. By integrating crushing, screening, grinding, grading, and return material functions into the same machine body 1 and arranging them sequentially from top to bottom, the material flows automatically under gravity, eliminating the need for external conveying devices, thus significantly reducing energy consumption and equipment footprint. At the same time, the large-diameter discharge end of the screening mechanism is connected to the first return material mechanism 14 via the first return material port 102 and returns to the feed end of the crushing chamber, and the large-diameter discharge end of the grading mechanism is connected to the second return material mechanism 15 via the second return material port 103 and returns to the feed end of the grinding chamber, forming two independent closed-loop return material paths. Insufficiently crushed particles are returned to the crushing process, and powder that is not ground to standard is returned to the grinding process, ensuring that the finished product particle size is uniform and effectively improving the finished product qualification rate.

[0023] In a preferred embodiment, the crushing mechanism includes a primary crushing component and a secondary crushing component arranged sequentially along the material travel direction. The crushing particle size of the primary crushing component is larger than that of the secondary crushing component. The primary crushing component includes two toothed rollers 2 that rotate relative to each other, with crushing teeth on their surfaces. The secondary crushing component includes two hammer rollers 3 that rotate relative to each other, with hammers on their surfaces. The gradient combination of coarse crushing by the toothed rollers 2 and fine crushing by the hammer rollers 3 forms a progressive crushing chain of coarse and medium crushing. The primary crushing component first crushes large pieces of material into medium-sized particles, and the secondary crushing component then crushes the medium-sized particles into fine particles. This avoids over-crushing or material jamming caused by single-stage crushing, making the particle size of the particles entering the grinding chamber more uniform, effectively reducing the load and wear of the grinding mechanism, and extending the service life of the equipment.

[0024] In a preferred embodiment, the screening mechanism includes a grading screen 4 and a vibrator 5. The grading screen 4 is located at the bottom of the buffer chamber, and the vibrator 5 is located on one side of the buffer chamber and is connected to the grading screen 4 in a transmission manner. The grading screen 4 is inclined, with the lower inclined end of the grading screen 4 being the large-diameter discharge end of the screening mechanism and the bottom of the grading screen 4 being the small-diameter discharge end of the screening mechanism. The inclined grading screen 4, in conjunction with the vibrator 5, accelerates the screening efficiency and effectively prevents the screen holes from clogging under the action of vibration. The structural design with the lower inclined end being the large-diameter discharge end and the bottom being the small-diameter discharge end allows coarse particles that do not pass through the screen to automatically slide down the inclined screen surface to the large-diameter discharge end and enter the first return port 102 under the combined action of gravity and vibration, without the need for additional power drive, thus realizing online automatic grading and coarse separation of the crushed material.

[0025] In a preferred embodiment, the grinding mechanism includes a drive mechanism, a moving grinding disc 7, a stationary grinding disc 9, and an adjustment component. The fixed end of the drive mechanism is fixedly connected to the machine body 1, and the output end of the drive mechanism is driven to rotate the moving grinding disc 7. The stationary grinding disc 9 is slidably connected to the inner wall of the machine body 1 in the vertical direction, forming a grinding gap between the stationary grinding disc 9 and the moving grinding disc 7 for material to pass through. The fixed end of the adjustment component is fixedly connected to the machine body 1, and the output end of the adjustment component is fixedly connected to the stationary grinding disc 9 to move the stationary grinding disc 9 in the vertical direction to adjust the size of the grinding gap. The drive mechanism drives the moving grinding disc 7 to rotate at high speed. The material is pulverized into micron-sized powder by the combined effects of shearing, squeezing, and friction in the grinding gap between the moving grinding disc 7 and the stationary grinding disc 9. The adjustment component drives the stationary grinding disc 9 to slide in the vertical direction, realizing online stepless adjustment of the grinding gap. The grinding precision can be flexibly adjusted according to the fineness requirements of different powder coatings (such as 30~200μm) without stopping or disassembling the machine, which greatly improves the applicability and production efficiency of the equipment.

[0026] In a preferred embodiment, the adjustment component is an electric push rod 8, the driving mechanism is a drive motor 6, and the grinding surface of the moving grinding disc 7 is provided with grinding patterns. The electric push rod 8, as the adjustment component, has a fast response speed and high control precision, and can realize the automatic and precise adjustment of the grinding gap. The drive motor 6 provides stable and reliable rotational power for the moving grinding disc 7. The grinding patterns provided on the grinding surface of the moving grinding disc 7 increase the shearing and friction of the material during the grinding process, thereby improving the grinding efficiency and the uniformity of powder fineness.

[0027] In a preferred embodiment, the grading mechanism includes a grading housing 10, an air inlet pipe 11, and an induced draft fan 12. The feed end of the grading housing 10 is connected to the discharge end of the grinding chamber. The air inlet pipe 11 is provided on one side of the grading housing 10, and the finished product collection port 104 is provided on the other side of the grading housing 10. The bottom of the grading housing 10 is provided with a second return port 103. The induced draft fan 12 is located at the finished product collection port 104. The induced draft fan 12 provides negative pressure at the finished product collection port 104. The airflow entering from the air inlet pipe 11 blows the ground powder up inside the grading housing 10. The qualified fine powder with smaller particle size is carried by the airflow and drawn out by the induced draft fan 12 to the finished product collection port 104. The unqualified coarse powder with larger particle size settles into the bottom of the grading housing 10 due to gravity and is discharged through the second return port 103. This realizes online pneumatic grading of the ground powder, with high grading accuracy and no dust overflow.

[0028] In a preferred embodiment, an airflow regulating valve 13 is provided at the air inlet of the air inlet pipe 11. Several baffles are provided inside the grading housing 10 between the air inlet pipe 11 and the finished product collection port 104. The baffles are arranged in an alternating pattern. The airflow regulating valve 13 can flexibly adjust the airflow according to the fineness requirements of different powder coatings, thereby controlling the grading and cutting particle size. The alternating baffles extend the residence path and residence time of the powder in the grading area, allowing fine powder and coarse powder to be more fully separated in the airflow, further improving the grading accuracy and the concentration of the finished product particle size distribution.

[0029] In a preferred embodiment, the first return mechanism 14 and / or the second return mechanism 15 are spiral conveying pipes. The spiral conveying pipes adopt a closed structure, so there is no dust emission during the conveying and return process, which improves the production environment. At the same time, the spiral conveyor has self-cleaning characteristics, so the material is not easy to accumulate and block in the pipe. The conveying process is stable and reliable, ensuring the smooth flow of the return path.

[0030] In a preferred embodiment, the outer side of the machine body 1 is provided with a sealing cover, and a sound insulation cavity is formed between the sealing cover and the machine body 1. The sound insulation cavity is filled with sound insulation material. The sound insulation material (such as glass wool, rock wool, etc.) in the sound insulation cavity can absorb and block the noise generated by the operation of the equipment, significantly reducing the interference of the equipment operation noise to the operator and meeting the requirements of environmentally friendly production.

[0031] In a preferred embodiment, the system further includes a control unit 16, which is electrically connected to the crushing mechanism, screening mechanism, grinding mechanism, and grading mechanism. As the central nervous system of the equipment, the control unit 16 realizes centralized control and coordinated operation of the crushing, screening, grinding, and grading mechanisms. It can automatically adjust the operating status of each mechanism according to preset process parameters, eliminating the need for manual operation, thus greatly improving the automation level and production consistency of the equipment, and reducing labor costs and human error.

[0032] Example 2 The present invention also provides a method for using the multi-stage crushing-grinding integrated equipment for powder coating production as described in any of the above claims, comprising the following steps: (a) Equipment startup: The equipment is started by the control unit 16, which sequentially or simultaneously activates the drive motor 6 of the crushing mechanism, the vibrator 5 of the screening mechanism, the drive motor 6 of the grinding mechanism, the induced draft fan 12 of the grading mechanism, the return motor of the first return material mechanism 14, and the return motor of the second return material mechanism 15, putting each mechanism into standby operation. The preferred starting sequence is to start the induced draft fan 12 and the return motor first, followed by the grinding and crushing mechanisms, to avoid material accumulation and blockage inside the equipment.

[0033] (II) Feeding and Multi-stage Crushing: The extruded and compressed sheet material is fed into the crushing chamber through the feed inlet 101 at the top of the machine body 1. The material first falls into the primary crushing component of the crushing mechanism, where two toothed rollers 2 rotate relative to each other. The crushing teeth on the surface of the toothed rollers 2 crush the sheet material into medium-sized particles of 5-10mm. The medium-sized particles after coarse crushing enter the secondary crushing component via the guide plate. Two hammer rollers 3 rotate relative to each other, and the hammers on the surface of the hammer rollers 3 further crush the medium-sized particles into fine particles of 1-3mm through impact. The gradient combination of coarse crushing by the toothed rollers 2 and fine crushing by the hammer rollers 3 forms a progressive crushing chain of coarse and medium crushing, avoiding over-crushing or material jamming problems caused by single-stage crushing.

[0034] (III) Screening and grading: The crushed fine particles fall onto the inclined grading screen 4 at the bottom of the buffer chamber. The vibrator 5 drives the grading screen 4 to vibrate, thus classifying the crushed particles by size. Small particles with a diameter smaller than the screen mesh size (e.g., 1 mm) pass through the screen under vibration and fall into the grinding chamber to enter the next grinding process. Large particles larger than the screen mesh size cannot pass through the screen. Under the action of vibration and gravity, they slide down the inclined screen surface to the large particle discharge end at the lower end of the inclined screen. They enter the first return material mechanism 14 through the first return material port 102 and are transported back to the feed end of the crushing chamber by the spiral conveyor blades. They are then mixed with the newly added flaky material and crushed again.

[0035] (iv) Grinding process: Small-diameter particles passing through the screen enter the grinding chamber and fall into the grinding gap between the moving grinding disc 7 and the stationary grinding disc 9. The drive motor 6 drives the moving grinding disc 7 to rotate at high speed (preferably 1000~3000 rpm). The grinding texture on the grinding surface of the moving grinding disc 7 and the stationary grinding disc 9 generate strong shearing, squeezing and friction on the material, crushing the small-diameter particles into micron-sized powder (30~200μm).

[0036] During this process, the electric push rod 8 is extended and retracted by the control unit 16, causing the stationary grinding disc 9 to slide vertically along the inner wall of the machine body 1, thereby adjusting the grinding gap between the moving grinding disc 7 and the stationary grinding disc 9. When finer powder is required, the electric push rod 8 is controlled to push the stationary grinding disc 9 downward, reducing the grinding gap (e.g., adjusting to 30μm); when coarser powder is required, the electric push rod 8 is controlled to pull the stationary grinding disc 9 upward, increasing the grinding gap (e.g., adjusting to 200μm). The grinding gap can be adjusted online during equipment operation without stopping the machine.

[0037] (v) Strength Classification: The ground micron-sized powder falls from the bottom outlet of the grinding chamber into the classifying shell 10. The air inlet pipe 11 introduces airflow into the classifying shell 10 (the airflow direction is perpendicular to or at a certain angle to the powder falling direction). The blower 12 provides negative pressure at the finished product collection port 104, blowing the powder up in the classifying shell 10 and forming a gas-solid two-phase flow. As the powder flows through several staggered baffles, the smaller qualified powder particles are carried by the airflow through the baffle area due to their light weight, and are drawn out by the blower 12 to the finished product collection port 104 through the qualified particle size discharge end. The larger unqualified powder particles fall to the bottom of the classifying shell 10 due to gravity settling, enter the second return port 103 through the large particle size discharge end, and are sent back to the feed end of the grinding chamber by the spiral conveying pipe. They are then mixed with the sieved small-diameter particles and ground again.

[0038] Furthermore, the airflow is controlled by adjusting the opening of the airflow regulating valve 13 at the air inlet of the air inlet pipe 11, thereby adjusting the particle size of the pneumatic classification. When it is necessary to improve the classification accuracy, the airflow regulating valve 13 is appropriately closed to reduce the airflow, so that only finer powders can be carried away by the airflow; when it is necessary to improve the finished product yield, the airflow regulating valve 13 is appropriately opened to increase the airflow, so that coarser powders can also be carried by the airflow into the finished product collection port 104.

[0039] (vi) Finished product collection and continuous recycling: The qualified powder collected in the finished product collection port 104 is packaged to become the finished powder coating. Throughout the production process, the feeding, crushing, screening, grinding, grading, and return processes are continuously carried out, forming a continuous closed-loop cycle of crushing, screening, grinding, grading, and return. First closed loop (coarse material return from screening): Large-diameter particles separated by the screening mechanism are returned to the crushing chamber by the first return mechanism 14 for re-crushing, ensuring that the particle size of the material entering the grinding chamber is smaller than the screen mesh size. Second closed loop (grading coarse powder return): Large-sized powder that does not meet the standard is separated by the grading mechanism and returned to the grinding chamber by the second return mechanism 15 for re-grinding to ensure that the particle size of the finished product meets the qualified standard.

[0040] The two closed loops mentioned above operate independently until all input materials are processed into qualified finished products.

[0041] Throughout the entire operation, the sealing cover at the feed inlet 101 remains closed. The sealing cover on the outside of the machine body 1 and the sound insulation material inside the sound insulation cavity work together to seal and reduce noise, preventing dust from escaping and reducing equipment operating noise. The control unit 16 monitors the operating parameters of each mechanism in real time (such as current, speed, temperature, etc.) and automatically executes interlock protection actions when abnormalities occur to ensure safe and stable operation of the equipment.

[0042] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An integrated multi-stage crushing-grinding equipment for powder coating production, characterized in that: include: The machine body has a feed inlet, a first return inlet, a second return inlet, and a finished product collection inlet at its top. The interior of the machine body, from top to bottom, comprises a crushing chamber, a buffer chamber, and a grinding chamber. A crushing mechanism is disposed within the crushing chamber and is used for multi-stage crushing of materials; A screening mechanism is provided in the buffer chamber for classifying the crushed material by particle size. The large-diameter discharge end of the screening mechanism is connected to the first return port, and the small-diameter discharge end of the screening mechanism is connected to the grinding chamber. A grinding mechanism is disposed inside the grinding chamber and is used to grind the sieved material; A grading mechanism is provided at the discharge end of the grinding mechanism for pneumatic classification of the ground material. The large-diameter discharge end of the grading mechanism is connected to the second return port, and the qualified-diameter discharge end of the grading mechanism is connected to the finished product collection port. The first return mechanism has one end connected to the first return port and the other end extending to the feed end of the crushing chamber. as well as The second return mechanism has one end connected to the second return port and the other end extending to the feed end of the grinding chamber.

2. The integrated multi-stage crushing-grinding equipment for powder coating production according to claim 1, characterized in that: The crushing mechanism includes a primary crushing component and a secondary crushing component arranged sequentially along the material travel direction. The crushing particle size of the primary crushing component is larger than that of the secondary crushing component. The primary crushing component includes two toothed rollers that rotate relative to each other, and the surface of the toothed rollers is provided with crushing teeth. The secondary crushing component includes two hammer rollers that rotate relative to each other, and the surface of the hammer rollers is provided with hammers.

3. The integrated multi-stage crushing-grinding equipment for powder coating production according to claim 1, characterized in that: The screening mechanism includes a grading screen and a vibrator. The grading screen is located at the bottom of the buffer chamber, and the vibrator is located on one side of the buffer chamber and is connected to the grading screen in a transmission manner. The grading screen is inclined, with the lower inclined end of the grading screen being the large-diameter discharge end of the screening mechanism, and the bottom of the grading screen being the small-diameter discharge end of the screening mechanism.

4. The integrated multi-stage crushing-grinding equipment for powder coating production according to claim 1, characterized in that: The grinding mechanism includes a drive mechanism, a moving grinding disc, a stationary grinding disc, and an adjustment component. The fixed end of the drive mechanism is fixedly connected to the machine body, and the output end of the drive mechanism is drivenly connected to the moving grinding disc to drive the moving grinding disc to rotate. The stationary grinding disc is slidably connected to the inner wall of the machine body in the vertical direction, forming a grinding gap between it and the moving grinding disc for material to pass through. The fixed end of the adjustment component is fixedly connected to the machine body, and the output end of the adjustment component is fixedly connected to the stationary grinding disc to drive the stationary grinding disc to move in the vertical direction to adjust the size of the grinding gap.

5. The integrated multi-stage crushing-grinding equipment for powder coating production according to claim 4, characterized in that: The adjustment component is an electric push rod, the driving mechanism is a drive motor, and the grinding surface of the moving grinding disc is provided with grinding patterns.

6. The integrated multi-stage crushing-grinding equipment for powder coating production according to claim 1, characterized in that: The grading mechanism includes a grading shell, an air inlet pipe, and an induced draft fan. The feed end of the grading shell is connected to the discharge end of the grinding chamber. The air inlet pipe is provided on one side of the grading shell, and the finished product collection port is provided on the other side of the grading shell. The second return port is provided at the bottom of the grading shell, and the induced draft fan is located at the finished product collection port.

7. The integrated multi-stage crushing-grinding equipment for powder coating production according to claim 6, characterized in that: An air volume regulating valve is installed at the air inlet of the air inlet pipe.

8. The integrated multi-stage crushing-grinding equipment for powder coating production according to claim 1, characterized in that: The first return mechanism and / or the second return mechanism are spiral conveying pipes.

9. The integrated multi-stage crushing-grinding equipment for powder coating production according to claim 1, characterized in that: The exterior of the machine body is provided with a sealing cover, and a sound insulation cavity is formed between the sealing cover and the machine body. The sound insulation cavity is filled with sound insulation material.

10. A method of using the integrated multi-stage crushing-grinding equipment for powder coating production as described in any one of claims 1 to 9, characterized in that: Includes the following steps: S1: Start the equipment: Start the crushing mechanism, the screening mechanism, the grinding mechanism, the grading mechanism, the first return material mechanism, and the second return material mechanism; S2: Feeding and Crushing: The extruded and compressed sheet material is fed into the crushing chamber through the feed inlet, and the crushing mechanism performs multi-stage crushing on the material to obtain crushed particles; S3: Screening and grading: The crushed particles fall into the buffer chamber, and the screening mechanism classifies the crushed particles by particle size. Small particles with a particle size smaller than the screen mesh size pass through the screening mechanism and enter the grinding chamber. Large particles with a particle size larger than the screen mesh size enter the first return mechanism from the large particle size discharge end of the screening mechanism through the first return port, and are sent back to the feed end of the crushing chamber by the first return mechanism for re-crushing. S4: Grinding process: Small-diameter particles entering the grinding chamber are pulverized into micron-sized powder under the grinding action of the grinding mechanism; S5: Pneumatic Classification: The ground powder enters the classification mechanism and is pneumatically classified under the action of airflow. Powder with qualified particle size enters the finished product collection port from the qualified particle size discharge end of the classification mechanism and is collected. Powder with large particle size that does not meet the standard enters the second return material mechanism from the large particle size discharge end of the classification mechanism through the second return material port and is sent back to the feed end of the grinding chamber for re-grinding by the second return material mechanism.

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